He _____ have gone to Shanghai, for I saw him a moment ago.
A．mustB．can’tC．mustn’tD．can
B

試題分析：考查情態(tài)動詞；句意：他不可能去上海了，因為我剛剛看見他了。can’t have done過去不可能做了，A must have done過去一定做了， C mustn’t不和have done連用， D can和have done表示推測，連用一般用否定和疑問句，選B。
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